Piano-action.



I. WROZINA.

PIANO ACTION. APPLICATION nun JULY 11.1910.

Patented Dec. 27, 1910.

"Mu "MW" W IGNATZ WROZINA, OF WES HAVEN, CONNECTICUT.

PIANO-ACTION.

Specification of Letters Patent.

Patented Dec. 27, 1910.

Application filed July 11, 1910. Serial No, 571,353.

To all whom it may concern:

lie it. known that I, lonivrz \Ynozma, a subject of the Emperor of Austria-Hungary, residing at West Haven, in the county of New Haven and State of Connecticut, have invented a new and useful. in'iprovement in Piano-Actions; and I do hereby declare the following, when taken in connection with the accompanying drawing and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawing constitutes part of this specification and represents a view in side elevation of a piano-action constructed in accordance with my invention.

My invention relates to an improvement in actions for upright pianos, the object being to provide for such pianos a simple and durable action, not likely to get out of order, and constructed with particular reference to power and capacity for repetition.

lVith these ends in view my invention consists in a piano-action having certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claims.

In carrying out my invention as herein shown, the abstract or fly 2 is provided with an inwardly extending upwardly inclined rigid arm 3 forming whatis called a set-oil. An anti-friction roller 4 mounted. in the upper end of this set-off 3, co-acts with a cam 5 protected by a fibrous or leather strip 6 and located upon the forward face of the lower end of a damper-lever 7 which is hung on a pin 8 in an ordinary damperflange 9 attached by a screw 10 to the top of the hannner-hutt rail 11. The upper end of the damper-lever 7 receives the wire shank 12 of a damper-block 13, the cushion 11 of which acts upon the string 15. A damperspring 16 secured at its lower end to the flange 9, presses at its upper end against a lug 17 formed upon the outer face of the upper end of the lever 77 hen so arranged, the spring 16 exerts a constant effort to press the cushion 14c of the damper-block 13 against the string 15. The spring 16 also exerts a constant effort to swing the lower end of the lever 7 out ard or forward, whereby the cam 5 upon the lower end of the lever exerts a constant etlort to push the set-oil 3 downward with the effect of also pushing downward upon the fly or abstract 2 which is at the same time given the opportunity of falling inward on account of the conformation of the lower end of the cam In other words, the spring 16 exerts a constant eflort to restore the upper end of the fly 2 to its normal position below the hammer-butt 18 which is mounted on a pivot 19 in a vertically arranged flange 10 secured to the hannner-butt rail 11, the pivot 19 forming the main pivot, as it were, of the action.

The hammer-butt 18 receives the hammershank 20 to the outer end of which the hammer-head 21 is fastened, the hammer-head being furnished with a cushion 22 which makes contact with the wire 15. The ha1n mer-shank 20, and hence the hammer-head 21, is normally supported upon a horizontal hammer-rest rail 23 having a cushioning strip 2 1. The hammer-butt 18 also receives a catcher-shank 25 carrying a catcher 26 which is furnished with a facing 27, and which co-acts with a check 28 having a vertically arranged wire 29 entered at its lower end into an offset 30 at the upper end of the fly 2.

A hammer-retracting spring 31 secured at its lower end to the fly 2 at a point just above the arm 30, is formed at its upper end with a hook 32 passing through a loop 33 of silk cord secured to the hammer-butt 18, the spring 31 being set so as to exert a constantefi ort to swing the hammer-butt 18 outwardly, and thus pull the hammer away from the string into its normal position.

Near its lower end the abstract 2 is provided with the usual link 34 the inner end of which is pivoted to a flange 35 secured to the rail 36. The lower end of the abstract or fly 2 rests, as usual, upon an adjustable capstan 37 mounted in the upper face of the inner end of the key-lever 38 which rocks upon a center-pin 39 in the usual manner. The rail 36 also carries a check 40 for the lower-end of the damper-lever 7.

The coaction of the upper end of the fly or abstract 2 directly with the lower face of the hammer-butt 18, gives my action very great power and durability. Furthermore, as the spring 16, as well as the spring 31, are placed under stress by the depression of the key, the power represented by those springs is in readiness to act upon the slightest removal of pressure from the key to pull the upper end of the fly or abstract downward and re-position it under the hammerbutt, whereby, by my ilHPl'OYGtl action, I secure exceptional repetition, as the quick repeated notion of the key is termed.

1. In an upright-piano action, the combination with the hunnner-hutt and fly thereof,

of a dzunper-lever, a spring therefor, and :1

eet-oti carried by the tly and engaging with the lower end of the dznnper-lerer.

2. In an upright-piano action, the combination with the hennner-hutt and fly thereof, of a damper-lever provided at its lower end with 21 einn, =1 spring eoaeting with the said dznnper-lei'er to press its upper end inward and its lower end outward, and 21 set-ott' carried by the tiy and extending inwardly therefrom in position to engage with the coin curried by the damper-lever.

3. In an upright-piano action, the combination with the hammer-butt and iiy thereof, of H damper-lever provided upon the outer :tzu-e of its lower end with a cum, :1 spring eoueting with the dinnper-lever to swing its upper end inward and its lower end outward, and a set-ott carried by the fly and extending inwardly theretroin tor engagement with the cam ot' the damper leyer.

i. In an upright-piano action, the combinenon with the hammer-butt and fly thereot,

0t 21 damper-lever, n enni at the lower end 

